Aliphatic carboxylate

Ester perfumes synthesized from carboxylic acids and alcohols are a very important class of perfumes. Depending on the raw materials used in the synthesis, it can be roughly classified into aliphatic carboxylic acid esters, aromatic carboxylic acid esters, carboxylic acid esters containing an alkene, an alkyne unsaturated bond, and other esters. The ester perfume is characterized in that the carboxylate can be considered as a product in which the hydroxyl group of the acid is substituted by an alkoxy group, since the hydroxyl group of the carboxyl group can be substituted by one or more alkoxy groups, so that a monoester, a diester or a polyester can be formed. . Further, the alcohol may have a plurality of hydroxyl groups, and thus the alkoxy group may form a monocarboxylic acid or a polycarboxylic acid ester with one or more carboxyl groups. The aroma, aroma type, strength and characteristics of the ester are related to the structure of the ester. The esters of lower carboxylic acids and lower alcohols are generally volatile liquids with aromas of flowers, fruits and grasses. An ester of a lower carboxylic acid and a lower terpene alcohol with a floral aroma. Esters with aryl groups, most with floral aroma. The esters of aromatic acids and aromatic alcohols, although not strong in aroma, have a high boiling point and a long lasting aroma. Ester perfumes are widely distributed in nature, and are found in roots, stems, leaves, fruits, seeds, bark, and flowers of plants; they are also present in certain animal secretions. Synthetic ester fragrances are more. Since the synthesis of esters is easy, the source of raw materials is wide, and the synthetic esters are many types and inexpensive, they are widely used. Aliphatic compounds are also known as open chain compounds. One of the basic types of organic compounds. A compound in which a carbon atom in a molecule is linked to have a chain structure. According to the structure and properties of the open chain, it can be divided into saturated and unsaturated aliphatic hydrocarbons. The former has only a single bond between carbon atoms, such as ethane, ethanol, etc.; the latter has double and triple bonds between carbon atoms, such as ethylene and acetylene. Therefore, paraffinic hydrocarbons, olefins and alkynes and their derivatives are all such compounds. Usually only the chain of carbon atoms is considered, the unbranched is called a straight chain, and the branched part is called a side chain. Such compounds are abundant in nature and industrial production, such as alkanes in lake marshes, olefins in forests, and alkyl lead in automobile exhausts.